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No, it's not Cobblers Dream. It was not about a horse rescue.
It was about a young girl, who, at the start of the book was given the worst horse in a riding stables to ride. Next thing she knows, she wakes up in hospital after a bad fall. Then someone gives her a mare that has been really badly treated in the past, and by rehabilitating the horse, she finds a new friend and at the end they ride to the rescue of someone (can't remember exactly what)! Think the mare is possibly called Lady but not dead certain on that one. I would really LOVE to read that book again!